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Show Parts for Model:

UB oil pressure switch

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Author  [Modern View]

06-29-2014 06:57:42

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Doing wiring on UB Special diesel. Wire disconnected to one side of oil pressure switch.Where does it connect to? It has a large eyelet. Oher side connects to hourmeter.

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Jim Haugen

06-29-2014 11:25:04

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 Re: UB oil pressure switch in reply to Molinegb, 06-29-2014 06:57:42  
It sounds like it needs to pick up a positive voltage. The oil pressure switch is a NO (Normally Open) switch. When the engine is running, oil pressure completes the circuit to the hourmeter.

Seems like there ought to be a fuse in there somewhere.

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07-01-2014 05:29:51

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 Re: UB oil pressure switch in reply to Jim Haugen, 06-29-2014 11:25:04  
Supply comes from ammeter. According to hourmeter large eylet is connected to ground somewhere.

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Jim Haugen

07-02-2014 11:07:15

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 Re: UB oil pressure switch in reply to Molinegb, 07-01-2014 05:29:51  
If the B+ is from the ammeter, then it needs a ground after the oil pressure switch so that the hourmeter will run only if there is oil pressure present.

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07-02-2014 12:14:56

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 Re: UB oil pressure switch in reply to Jim Haugen, 07-02-2014 11:07:15  
Being an electronics tech by trade I know how the switch works. Apparently the hour meter and the diesel starting aid were options. Most oil pressure switches were mounted and teed into oil pressure line where oil line comes out of crankcase. Being dealer installed options my dealer decided to tee into line at oil pressure gauge in dash. The large eylet probably was mounted to 3/8 bolt on crankcase.

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